Spontaneous and Fast Molecular Motion at Room Temperature in the Solid State

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Nanotechnology

Background:

• Developing complex molecular machines requires versatile building blocks.
• Building blocks need to be easily characterized and visualized.
• Solid-state mobility is crucial for nanobots navigating biological systems.

Purpose of the Study:

• To create a novel molecular system with dual emissive properties.
• To enable visualization of solid-state molecular rearrangements.
• To develop building blocks for advanced molecular machines and nanobots.

Main Methods:

• Synthesis of a novel emissive molecular system.
• Characterization of emissive properties in amorphous and crystalline states.
• Investigation of π-π interactions and their effect on fluorescence.
• Analysis of molecular rearrangement dynamics in the solid state.

Main Results:

• The molecular system is emissive in the amorphous state and non-fluorescent in the crystalline state.
• Extensive π-π interactions in the crystalline state quench fluorescence.
• Mechanical disruption (scratching) of the crystalline state restores emission.
• Spontaneous reformation of π-π interactions leads to emission quenching within 20 seconds at room temperature.

Conclusions:

• The developed molecular system exhibits controllable solid-state emission.
• This property facilitates the visualization of molecular rearrangements.
• The system holds potential as a building block for functional nanobots and molecular machines.